Weird Divide by Zero Error in SQL - sql

Question

I have this query :
-- There are a select and joins in the query
--Then I have this Where part
WHERE
(
dbo.Table.Furnished IS NULL
OR dbo.Table.Furnished = 0
)
AND (
dbo.Table.Type2 = N'House'
)
AND (
dbo.Table.Type3 = N'ForSale'
)
AND (
dbo.Table.FixedArea/ dbo.Table.ToiletNumber< 250
)
AND (
dbo.Table.FixedArea> 25
)
AND (
CASE
WHEN dbo.Table.Segment1 = 1 THEN
'FirstGroup'
WHEN dbo.Table.Segment1 = 2 THEN
'SecondGroup'
WHEN dbo.Table.Segment1 = 3 THEN
'ThirdGroup'
ELSE
'Undefined'
END <> 'Undefined'
)
AND (
dbo.Table.Segment2 <> N'Undefined'
)
OR
(
dbo.Table.Furnished IS NULL
OR dbo.Table.Furnished = 0
)
AND (
dbo.Table.Type2 = N'Commercial'
)
AND (
dbo.Table.Type3 = N'ForSale'
)
AND (
dbo.Table.FixedArea/ dbo.Table.ToiletNumber< 250
)
AND (
dbo.Table.FixedArea> 25
)
AND (
CASE
WHEN dbo.Table.Segment1 = 1 THEN
'FirstGroup'
WHEN dbo.Table.Segment1 = 2 THEN
'SecondGroup'
WHEN dbo.Table.Segment1 = 3 THEN
'ThirdGroup'
ELSE
'Undefined'
END <> 'Undefined'
)
AND (
dbo.Table.Segment2 <> N'Undefined'
)
When I add this part below at the bottom of my original query (which doesn't have any division or something like that), I get Divide by zero error encountered.
OR
(
dbo.Table.Geo IS NOT NULL
)
AND (
dbo.Table.FixedArea > 0
)
AND (
dbo.Table.Price > 0
)
AND (
dbo.Table.RoomNumber LIKE N'%+%'
)
AND (
dbo.Table.Furnished IS NULL
OR dbo.Table.Furnished = 0
)
AND(
dbo.Table.Type3 = N'ForRent'
)
Why am I getting this divide by zero error? I'm not adding any division. I'm just adding some new filters. Please help me with this error. Thanks.

Answer 1

You actually do here dbo.Table.FixedArea/ dbo.Table.ToiletNumber< 250...and probably ToiletNumber is zero
EDIT: Try re-running your query by changing the above code to
dbo.Table.FixedArea / NULLIF(dbo.Table.ToiletNumber, 0) < 250

Answer 2

You div/0 is here:
(
dbo.Table.FixedArea/ dbo.Table.ToiletNumber < 250
)
This:
AND (
dbo.Table.FixedArea> 25
)
Probably removed any div/0
Now this:
AND (
dbo.Table.FixedArea > 0
)
Means that rows with a FixedArea between 0 and 25 probably has a 0 for ToiletNumber, and has to be evaluated
To fix:
case when ToiletNumber = 0 then 1
else dbo.Table.FixedArea/ dbo.Table.ToiletNumber
end <250